How to turn off the radio in the car? Press which one?

The car radio system is equipped with a power button, which can be turned off by pressing it, and it can be realized by holding this button for about 3 seconds when using it. The specific operation steps are as follows:

First, open the door on the cab side. ?

Second, step on the brake pedal. ?

Third, press the start button to start the engine. ?

Fourth, the dashboard is on.

Fifth, press and hold the power button and turn it off.